From NPR News

I don't want to complain about Frozen Planet, however, until I dish out a little praise.

After Oregonian editorial page editor Bob Caldwell died Saturday, the report from the newspaper on Sunday said he had suffered a heart attack.

That does appear to be the 63-year-old journalist's cause of death. But the circumstances surrounding his last moments were considerably more complicated.

Men who eat a lot of fatty foods have lower quality sperm than men who avoid them, a new study found.

Saturated fat, the stuff in meat and dairy foods, was associated with lower sperm counts. The men eating the most saturated fat had 35 percent fewer sperm than men eating the least.

On the bright side, the men who ate more omega-3 fats — the kind found in fish and some plants — had slightly more sperm that were correctly formed than their brethren who ate less.

Iran said Tuesday that it was unwilling to allow international nuclear inspectors to have complete access to a restricted military complex, called Parchin, which is near the capital Tehran. There are concerns that the complex may contain a facility designed to test explosives meant to trigger a nuclear chain reaction.

Rick Santorum won two Southern state GOP presidential primaries Tuesday, embarassing Mitt Romney who had predicted he'd take one.

Second-place finisher Newt Gingrich vowed to fight on to Tampa, tag teaming Romney along with Santorum. The "three-way dynamic," as he put it, is a winner for Gingrich and, perhaps, his dream of deal-making at the convention, and for Romney, too, whose Southern result could have been much worse if he'd been posting up against Santorum alone.

Good morning.

Our early headlines:

-- 'Tragic Day For All Of Belgium': 22 Children Killed In Bus Crash.

-- In Afghanistan, Panetta Says Mission Continues.

Repair crews are working this morning to restore power to thousands of homes and businesses in Boston's Back Bay district, "after two transformers caught fire Tuesday night, knocking out power" and sending think black smoke billowing over the area, our colleagues at WBUR report.

Judges at a war crimes tribunal convicted Congolese warlord Thomas Lubanga of snatching children from the street and turning them into killers. A sentencing hearing will now be scheduled. Lubanga faces a maximum sentence of life imprisonment.

There's been a horrible traffic accident inside a Swiss tunnel. At least 28 people — 22 of them children mostly around the age of 12 — were killed Tuesday night when the bus they were in crashed.

At Camp Leatherneck in southern Afghanistan today, Defense Secretary Leon Panetta urged U.S. military personnel to not be deterred from their mission and continue "to make life difficult" for the Taliban and al-Qaida, says NPR's Larry Abramson, who is travelling with Panetta.

The City Council in Trenton, N.J., rejected a contract to supply paper products because they didn't like the high price of hot drink cups. But without the contract, the city also didn't buy toilet paper. Finally, the city had to approve an emergency purchase. Senior centers, police headquarters and other city offices were running out of toilet tissue.

March Madness has barely begun and a key figure in Georgetown basketball has suffered an injury. Team mascot Jack the Bulldog has torn the doggie version of his ACL. Jack's keeper tweeted the injury was likely from jumping on the couch.

The same general area of Japan that was devastated by an earthquake and tsunami almost exactly one year ago was rattled today by a 6.9 magnitude temblor that led authorities to warn of another possible tsunami along the nation's northeast coast. (Note at 7:42 a.m. ET: The U.S.

After another set of presidential contests the story remains much the same — pundits say former Massachusetts Gov. Mitt Romney remains the front runner in the race for the 2012 Republican presidential nomination, but former Pennsylvania Sen. Rick Santorum continues his strong challenge.

It is time for the much-winnowed field of Republican presidential contenders to shrink a little further. It is time for Newt Gingrich to bid adieu and wrap up his bid for the nomination.

Rick Santorum, who won the Alabama and Mississippi primaries on Tuesday, has proven himself the conservatives' favored alternative to front-runner Mitt Romney. He did this by winning the voters who mattered most in the deep-dyed red states of Alabama and Mississippi, the white evangelical "born again" voters who cast more than two-thirds of the vote in each state.

It was a big night for Republican presidential candidate Rick Santorum. He won the primaries in Mississippi and Alabama. Mitt Romney was running third in both states.

Even as the job market is improving and other indicators are positive, the Federal Reserve wants to keep interest rates super low until 2014. The Fed reaffirmed that policy Tuesday. That's likely because the economy is still growing slowly — not nearly fast enough to sustain consistent, long-term job creation.

On Tuesday, President Obama received the endorsement of the nation's largest organized labor organization, the AFL-CIO. Collective bargaining has been under attack in several states, which has drained union resources. But labor leaders say that's made them more determined than ever to keep Obama in the White House.